JPH0436791B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a processing head device for a laser processing machine that focuses a laser beam and irradiates it onto a workpiece to perform cutting, welding, etc.

[Prior Art] Fig. 4 is a schematic diagram showing the configuration of a normal laser processing machine, in which 1 is a laser oscillator, 2 is a laser beam emitted from this laser oscillator, and 3 is a propagation path of this laser beam. duct, 4 is a reflecting mirror fixed to the duct 3 and changing the direction of the laser beam 2;
Reference numeral 5 denotes a processing head, which focuses the propagated laser beam 2 with a fixed processing lens 6, and emits a high-density beam from the tip 7 onto the workpiece 9 placed on the processing table 8. Laser energy is irradiated to perform laser processing such as cutting and welding while moving the processing head 5 or workpiece 9.

[Problems to be Solved by the Invention] In the laser processing machine as described above, abnormal operation occurs in the processing head 5 or the workpiece 9 due to, for example, an operator's erroneous operation or a failure of the control device. If the machining head 5 collides with its partner or the machining head 5 collides with surrounding objects, an accident may occur in which not only the machining head 5 but also the duct 3, reflector 4, etc. are damaged due to the impact of the collision.

When such a damage accident occurs, there is a problem in that a large amount of money is lost due to the cost of repairing the device and the suspension of the device during the period required for repair.

This invention was made to solve the above-mentioned problems, and even if there is an accident where the machining head collides, it is possible to minimize the damage caused by this accident. The purpose is to obtain a laser processing machine.

[Means for Solving the Problems] The laser processing machine according to the present invention has a ring-shaped cutout in the processing head, a switch held by an insulator is inserted into the cutout, and the contacts of the switch are inserted into the cutout. is connected to the equipment's emergency stop circuit.

[Function] In this invention, when the machining head collides with a surrounding object, etc., and this collision acts on the notch part, which has the smallest mechanical strength, the notch part bends or breaks, and the above-mentioned impact is absorbed. It buffers and reduces damage to parts other than the processing head. At the same time, the switch inserted into the notch is activated to stop the device via the emergency stop circuit.

[Embodiment of the Invention] FIG. 1 is a sectional view showing the structure of a processing head in a laser processing machine according to an embodiment of the invention.
7 is the tip of the processing head 5, 8 is the processing table,
9 is a workpiece, 11 is a processing head main body, 12 is a notch provided on the entire circumference of the cylindrical portion 13 of this processing head main body 11, and 14 is a part for attaching the processing head 5 to the processing machine main body 15 with bolts 16. The flange portion 17 for fastening is a switch inserted into a plurality of locations within the notch portion 12.

FIG. 2 is a detailed sectional view of the switch 17.
8 and 19 are insulators, and 20 and 21 are contacts, both contacts 20 and 2 of the switch 17 disposed in the notch 12.
1 are connected to an emergency stop circuit 23 as shown in FIG. 22 is a spring for keeping the contacts 20 and 21 in an OFF state at all times.

In the laser processing machine according to the present invention configured as described above, the laser beam focused in the processing head 5 is irradiated from the tip 7, and in the case of cutting, for example, the processing head 5 and the laser beam are connected to each other in order to draw the cutting pattern. By moving relative to the processing table 8, a cut product having a predetermined shape can be obtained.

In this case, if the machining head 5 or the machining table 8 operates abnormally due to operator error or failure of the control device, and the machining head 5 collides with the workpiece 9 or surrounding objects, the impact force from this collision Therefore, the cylindrical part 2 of the notch part 12 with the thinnest wall thickness
4 is damaged and deformed. At the same time, with this deformation, the spring 22 separating both contacts 20 and 21 in the switch 17 inserted into the notch 12 deforms, so that at least one set of contacts among the plurality of switches 17 When 20 and 21 come into contact, the emergency stop circuit 23 shown in FIG. 3 is activated and the device is stopped.

Moreover, since the cylindrical portion 24 of the notch 12 is deformed, the impact force exerted on parts other than the machining head 5 in the event of a collision is alleviated, so that even if damage occurs, the damage will be minimal.

[Effects of the Invention] As explained above, in this invention, a notch is provided in the machining head, and when the machining head collides with surrounding objects, the notch is damaged and the switch inserted into the notch is damaged. Since it is configured to activate and bring the device to an emergency stop, the impact caused by a collision to areas other than the processing head is buffered, and the device can be stopped in an emergency to completely prevent accidents that may occur secondary to a collision. There is an effect that can be done. In addition, the switch inserted into the notch consists of a pair of insulators with contacts on their surfaces and a spring that separates the pair of insulators within the notch, so the switch itself is small and the device This has the effect of reducing the size of the device.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a processing head in a laser processing machine according to an embodiment of the present invention, and FIG.
The figure is a detailed sectional view of the switch in Figure 1, and Figure 3 is a connection diagram between this switch and the emergency stop circuit.
FIG. 4 is a schematic diagram showing the configuration of a normal laser processing machine. In the figure, 1 is a laser oscillator, 2 is a laser beam, 5 is a processing head, 9 is a workpiece, 12 is a notch, 14 is a flange, 17 is a switch, 2
0 and 21 are contacts, and 23 is an emergency stop circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1 In a laser processing machine that focuses a laser beam emitted from a laser oscillator and irradiates it onto a workpiece to perform processing such as cutting and welding, a notch provided around the entire circumference of the cylindrical part for attachment to the processing machine body. and a plurality of switches inserted into the notch, each of which has a contact on its surface, and a pair of insulators disposed in the notch so that the contacts face each other. When the machining head collides with a surrounding object, the notch is damaged and the switch is activated to cause an emergency stop of the device. A laser processing machine that is characterized by: